Sig Sauer
MCX-SPEAR LT, 5.56, 7.75", SBR, BLACK
Item # SIG WRMCX-556N-7B-R-LT-SBR MSRP $2,979.99FREE SHIPPING
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PRODUCT DETAILS
TECH SPECS:
Compact power, full modularity. The SIG MCX-Rattler LT (RMCX-556N-7B-LT-SBR) brings the Rattler’s short-stroke piston reliability into a more mission-capable, configurable platform — now optimized for 5.56 NATO with a 7.75″ cold-hammer-forged barrel for best-in-class compact performance.
Built for operators and shooters who need a stowable PDW that doesn’t compromise capability, the Rattler LT features fully ambidextrous controls, a folding Minimalist Plus stock, and an adjustable gas piston for reliable suppressed or unsuppressed operation. It ships with SIG’s flat-blade match trigger and SIG SLX/SLH suppressor-ready flash hider — a complete, ready-for-work package out of the box.
Why buyers choose the RMCX-556N-7B-LT-SBR
-
Ultra-compact 7.75″ cold-hammer-forged 5.56 NATO barrel for excellent terminal and suppressed performance in a compact chassis.
-
Fully ambidextrous controls (bolt catch/release, charging, selector) for intuitive manipulation from either shoulder.
-
Adjustable gas piston for tuned reliability with suppressed or unsuppressed ammunition; reduced fouling vs. direct-impingement designs.
-
Modular by design — compatible with LT barrels and handguards so you can reconfigure length and ergonomics in the field.
Key features at a glance
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Caliber: 5.56 NATO — 7.75 in cold-hammer-forged barrel, 1:7 twist, 5/8″-24 tapered shoulder threads.
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Action / Operating System: Semi-auto, Short-Stroke Piston with adjustable gas.
-
Stock / Controls: Folding Minimalist Plus stock; fully ambidextrous controls.
-
Forend / Rails: Alloy M-LOK / Picatinny interface for accessories.
-
Trigger: SIG Flat Blade Match (flat trigger shoe).
-
Magazine: AR-15 mag type — ships with (1) 30-rd polymer magazine.
-
Finish / Color: Black Anodized receiver.
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Compact dimensions: Overall length 25.9 in; folded 18.1 in; weight ~6.2 lb (2.8 kg) — highly stowable and mission ready.
Ready for duty or the range: the MCX-Rattler LT balances the smallest practical footprint with a full suite of combat-grade features — modular barrels/handguards, suppressor-ready muzzle, and operator-centric controls make it ideal for vehicle crews, breachers, and close-quarters roles.
| MCX Rattler LT SBR (WRMCX-556N-7B-LT-SBR) | |
|---|---|
| Caliber | 5.56 NATO / .223 Rem |
| Action | Gas-Operated, Semi-Automatic |
| Barrel Length | 5.5 in |
| Overall Length | 16.25 in (stock extended) |
| Weight | 5.3 lbs (unloaded) |
| Stock | Folding/Collapsible M-LOK Stock |
| Lightweight M-LOK Free-Float Rail | |
| Sights | Flip-up Iron Sights (Optional Optics Ready) |
| Magazine Capacity | 10 or 20-round compatible with STANAG magazines |
| Muzzle Device | Threaded (1/2-28) |
| Features | Ultra-Compact, Lightweight, Short-Barrel Rifle, Adjustable Folding Stock, Ambidextrous Controls |
| Country of Origin | USA |
Questions 0
Ask a QuestionProven Arms & Outfitters A bolt-action rifle requires the shooter to manually operate a bolt to load a round, eject the spent casing, and chamber the next round. In contrast, a semi-automatic rifle is designed to automatically eject the spent casing and chamber a new round with each pull of the trigger. Semi-automatic rifles offer faster follow-up shots, while bolt-action rifles are typically more accurate due to their design.
SORT BY MOST RECENT
No Customer Review on this product
PRODUCT DETAILS
TECH SPECS:
Compact power, full modularity. The SIG MCX-Rattler LT (RMCX-556N-7B-LT-SBR) brings the Rattler’s short-stroke piston reliability into a more mission-capable, configurable platform — now optimized for 5.56 NATO with a 7.75″ cold-hammer-forged barrel for best-in-class compact performance.
Built for operators and shooters who need a stowable PDW that doesn’t compromise capability, the Rattler LT features fully ambidextrous controls, a folding Minimalist Plus stock, and an adjustable gas piston for reliable suppressed or unsuppressed operation. It ships with SIG’s flat-blade match trigger and SIG SLX/SLH suppressor-ready flash hider — a complete, ready-for-work package out of the box.
Why buyers choose the RMCX-556N-7B-LT-SBR
-
Ultra-compact 7.75″ cold-hammer-forged 5.56 NATO barrel for excellent terminal and suppressed performance in a compact chassis.
-
Fully ambidextrous controls (bolt catch/release, charging, selector) for intuitive manipulation from either shoulder.
-
Adjustable gas piston for tuned reliability with suppressed or unsuppressed ammunition; reduced fouling vs. direct-impingement designs.
-
Modular by design — compatible with LT barrels and handguards so you can reconfigure length and ergonomics in the field.
Key features at a glance
-
Caliber: 5.56 NATO — 7.75 in cold-hammer-forged barrel, 1:7 twist, 5/8″-24 tapered shoulder threads.
-
Action / Operating System: Semi-auto, Short-Stroke Piston with adjustable gas.
-
Stock / Controls: Folding Minimalist Plus stock; fully ambidextrous controls.
-
Forend / Rails: Alloy M-LOK / Picatinny interface for accessories.
-
Trigger: SIG Flat Blade Match (flat trigger shoe).
-
Magazine: AR-15 mag type — ships with (1) 30-rd polymer magazine.
-
Finish / Color: Black Anodized receiver.
-
Compact dimensions: Overall length 25.9 in; folded 18.1 in; weight ~6.2 lb (2.8 kg) — highly stowable and mission ready.
Ready for duty or the range: the MCX-Rattler LT balances the smallest practical footprint with a full suite of combat-grade features — modular barrels/handguards, suppressor-ready muzzle, and operator-centric controls make it ideal for vehicle crews, breachers, and close-quarters roles.
| MCX Rattler LT SBR (WRMCX-556N-7B-LT-SBR) | |
|---|---|
| Caliber | 5.56 NATO / .223 Rem |
| Action | Gas-Operated, Semi-Automatic |
| Barrel Length | 5.5 in |
| Overall Length | 16.25 in (stock extended) |
| Weight | 5.3 lbs (unloaded) |
| Stock | Folding/Collapsible M-LOK Stock |
| Lightweight M-LOK Free-Float Rail | |
| Sights | Flip-up Iron Sights (Optional Optics Ready) |
| Magazine Capacity | 10 or 20-round compatible with STANAG magazines |
| Muzzle Device | Threaded (1/2-28) |
| Features | Ultra-Compact, Lightweight, Short-Barrel Rifle, Adjustable Folding Stock, Ambidextrous Controls |
| Country of Origin | USA |
SORT BY MOST RECENT
No Customer Review on this product
Questions 0
Ask a QuestionProven Arms & Outfitters A bolt-action rifle requires the shooter to manually operate a bolt to load a round, eject the spent casing, and chamber the next round. In contrast, a semi-automatic rifle is designed to automatically eject the spent casing and chamber a new round with each pull of the trigger. Semi-automatic rifles offer faster follow-up shots, while bolt-action rifles are typically more accurate due to their design.
